2 * System controller support for Armada 370 and XP platforms.
4 * Copyright (C) 2012 Marvell
6 * Lior Amsalem <alior@marvell.com>
7 * Gregory CLEMENT <gregory.clement@free-electrons.com>
8 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
10 * This file is licensed under the terms of the GNU General Public
11 * License version 2. This program is licensed "as is" without any
12 * warranty of any kind, whether express or implied.
14 * The Armada 370 and Armada XP SoCs both have a range of
15 * miscellaneous registers, that do not belong to a particular device,
16 * but rather provide system-level features. This basic
17 * system-controller driver provides a device tree binding for those
18 * registers, and implements utility functions offering various
19 * features related to those registers.
21 * For now, the feature set is limited to restarting the platform by a
22 * soft-reset, but it might be extended in the future.
25 #include <linux/kernel.h>
26 #include <linux/init.h>
27 #include <linux/of_address.h>
29 #include <linux/reboot.h>
32 static void __iomem *system_controller_base;
34 struct mvebu_system_controller {
35 u32 rstoutn_mask_offset;
36 u32 system_soft_reset_offset;
38 u32 rstoutn_mask_reset_out_en;
39 u32 system_soft_reset;
41 static struct mvebu_system_controller *mvebu_sc;
43 static const struct mvebu_system_controller armada_370_xp_system_controller = {
44 .rstoutn_mask_offset = 0x60,
45 .system_soft_reset_offset = 0x64,
46 .rstoutn_mask_reset_out_en = 0x1,
47 .system_soft_reset = 0x1,
50 static const struct mvebu_system_controller orion_system_controller = {
51 .rstoutn_mask_offset = 0x108,
52 .system_soft_reset_offset = 0x10c,
53 .rstoutn_mask_reset_out_en = 0x4,
54 .system_soft_reset = 0x1,
57 static struct of_device_id of_system_controller_table[] = {
59 .compatible = "marvell,orion-system-controller",
60 .data = (void *) &orion_system_controller,
62 .compatible = "marvell,armada-370-xp-system-controller",
63 .data = (void *) &armada_370_xp_system_controller,
65 { /* end of list */ },
68 void mvebu_restart(enum reboot_mode mode, const char *cmd)
70 if (!system_controller_base) {
71 pr_err("Cannot restart, system-controller not available: check the device tree\n");
74 * Enable soft reset to assert RSTOUTn.
76 writel(mvebu_sc->rstoutn_mask_reset_out_en,
77 system_controller_base +
78 mvebu_sc->rstoutn_mask_offset);
82 writel(mvebu_sc->system_soft_reset,
83 system_controller_base +
84 mvebu_sc->system_soft_reset_offset);
91 static int __init mvebu_system_controller_init(void)
93 struct device_node *np;
95 np = of_find_matching_node(NULL, of_system_controller_table);
97 const struct of_device_id *match =
98 of_match_node(of_system_controller_table, np);
100 system_controller_base = of_iomap(np, 0);
101 mvebu_sc = (struct mvebu_system_controller *)match->data;
108 arch_initcall(mvebu_system_controller_init);